Use flags set by the port allocator.
Use flags set by the port allocator.

Currently, port allocator flags are ignored. This is inconvenient if you
want to have your own PortAllocatorFactory subclass.

BUG=webrtc:3958
R=juberti@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/29919004

git-svn-id: a556c8bde68cedbc0208a1ffc78b06e9cd07f676@7524 4adac7df-926f-26a2-2b94-8c16560cd09d

dcpang/fatline-libjingle,dcpang/fatline-libjingle,dcpang/fatline-libjingle,dcpang/fatline-libjingle,sippet/talk,sippet/talk,sippet/talk,sippet/talk,dcpang/fatline-libjingle,sippet/talk